qmake: pass RELEASE variable to qmake invocation

qmake is not inheriting the env variables from the parent
process to work around this, it is directly passed as arg
to the qmake invocation

gui/build.sh

@@ -92,7 +92,7 @@ function buildQmake {
     echo "[+] Now building Qml app with Qt qmake"
     echo "[+] Using qmake in:" $QMAKE
     mkdir -p $QTBUILD
-    $QMAKE -early QMAKE_CC=$CC QMAKE_CXX=$CXX QMAKE_LINK=$CXX -o "$QTBUILD/Makefile" CONFIG+=release VENDOR_PATH="${VENDOR_PATH}" $PROJECT
+    $QMAKE -early QMAKE_CC=$CC QMAKE_CXX=$CXX QMAKE_LINK=$CXX -o "$QTBUILD/Makefile" CONFIG+=release VENDOR_PATH="${VENDOR_PATH}" RELEASE=${RELEASE} $PROJECT
     #CONFIG=+force_debug_info CONFIG+=debug CONFIG+=debug_and_release
 }